I've done the one day, two park several times. Had you gone to IOA, you probably would have seen the Spiderman maintenance area and control room. In the studios it depends, possibly you'll get to experience Twister when it resets for the next show, and see how the air pressure differences makes it nearly impossible to manually open the exit doors into the gift shop. You also might get to walk through the producer's building between the sound stages, possibly see the inside of a soundstage. I once took one of these tours when HHN construction was in full swing and one of the sound stages holding Dracula/Frankenstein had a non-public facing door open and we got to peek inside. This was before anything was announced.
It really depends on the guide - you could see some different things. It is definitely worth the money, in my opinion. While you're probably going to be walking backstage, a lot of what the tour is based on is an explanation of the history/back story/trivia of the park and front of the line access to the rides.
